Method and apparatus for bending sheet stock

• US 5,377,516 A
• Filed: 03/19/1992
• Issued: 01/03/1995
• Est. Priority Date: 03/19/1992
• Status: Expired due to Term

• Current Assignee: Laser Products, Inc.
• Original Assignee: Laser Products, Inc.
• Inventors: Lipari, B. J.
• Primary Examiner(s): JONES, DAVID B
• Application Number:
  US07/854,342
• Time in Patent Office: 1,020 Days
• Field of Search: 72/37, 72/33, 72/32, 72/34, 72/7, 72/384, 72/379.2, 364/474.07, 364/474.2, 364/164, 33/758, 33/759, 33/562, 33/563
• US Class Current: 72/37
• CPC Class Codes: B21D 5/004 with program control
• CPC Class Codes: B21D 5/02 on press brakes without making use of clamping means
• CPC Class Codes: B21D 53/00 Making other particular articles making wire fabrics B21F; making chains or chain parts B21L
• CPC Class Codes: G05B 19/4097 characterised by using design data to control NC machines, e.g. CAD/CAM G05B19/4093 takes precedence
• CPC Class Codes: G05B 2219/31424 Print label of finished part, with info, history, attach to part, docket
• CPC Class Codes: G05B 2219/35083 Parametric design, parameters for geometric design and for process planning
• CPC Class Codes: G05B 2219/35157 Machinability, producibility, reject nc program if tool motion not possible
• CPC Class Codes: G05B 2219/35192 From design derive sequence of bending so that bending is possible
• CPC Class Codes: G05B 2219/37403 Bending, springback angle
• CPC Class Codes: G05B 2219/45143 Press-brake, bending machine

Abstract

A method and apparatus for use in bending sheet stock to form a selected design is disclosed. The apparatus comprises a controller including a programmable system for calculating the positions and shapes of bends for bending the stock to the selected design and a sequence for making the bends, and a printer for printing instructions regarding the positions, shapes and sequence of the bends. The printer can print instructions directly on the stock or on a label for attachment to the stock. The instructions can be utilized by an operator or machine in bending the sheet stock. The invention improves the efficiency and accuracy of the process for bending sheet stock.

Claims

1. A method for use in bending sheet stock to form a side panel of a housing, said housing comprising said side panel and a front panel wherein said side panel is shaped to conform to said front panel, said method comprising the steps of:

inputting dimensional information regarding said housing;

calculating the positions and shapes of bends for bending said stock to form said side panel of said housing so that said side panel of said housing is shaped to conform to said front panel of said housing;

determining a sequence for making said bends wherein interference is avoided;

generating a signal indicative of the positions, shapes and sequence of said bends; and

printing instructions regarding the positions, shapes and sequence of said bends.

2. The method of claim 1, wherein said step of determining comprises testing a candidate bend for interference by:

storing position information for a first portion of said stock on one of the forward or rearward sides of a candidate bend;

projecting position information for a second portion of said stock on the other of the forward or rearward sides of said candidate bend for a plurality of positions corresponding to progressive formation of said candidate bend;

comparing said stored information and said projected information to determine whether interference occurs between said first and second portions.

3. The method of claim 1, wherein said step of determining comprises:

storing position information for tooling for bending said stock.

4. The method of claim 1, wherein said step of determining comprises:

a) selecting a candidate bend from a set of bends for bending said stock to form said side panel;

b) determining whether said candidate bend can be made without interference;

c) selectively storing information regarding a configuration of said stock including said candidate bend responsive to step b.

5. The method of claim 1, wherein said step of determining comprises:

a) storing position information for an initial configuration of said sheet stock;

b) selecting a candidate bend from a set of bends for bending said stock to form said side panel;

c) determining whether said candidate bend can be made without interference;

d) selectively assigning said candidate bend a sequence number and storing position information for a configuration of said sheet stock including said candidate bend;

e) repeating steps b) through d) until all bends from said set of bends have been assigned a sequence number.

6. The method of claim 1, wherein said step of printing comprises printing said information on a label, wherein information relating to successive bends is spaced on said label to match the spacing between corresponding bends to be made in said stock.

7. The method of claim 1, comprising the further step of attaching said label to said stock.

8. The method of claim 7, wherein said step of attaching comprises:

peeling a backing from said label; and

adhering said label to said stock.

9. The method of claim 7, wherein said step of attaching comprises:

longitudinally folding said label; and

positioning said label about an edge of said stock.

10. The method of claim 1, wherein said step of printing comprises printing instructions on said stock.

11. The method of claim 1, wherein said step of printing comprises printing machine readable instructions.

12. An apparatus for use in providing instructions regarding at least shapes and positions for making bends in sheet stock to form a side panel of a housing, said housing including said side panel and a front panel wherein said side panel is shaped to conform to said front panel, comprising:

first means for receiving input information indicative of a form of said housing;

second means for determining the shapes and positions of bends for bending the sheet stock to form said side panel of said housing so that said side panel of said housing is shaped to conform to said front panel of said housing;

third means for outputting output information indicative of the shapes and positions for making said bends.

13. The apparatus of claim 12, further comprising fourth means for determining a sequence for making said bends wherein interference between one portion of said sheet stock and another portion of said sheet stock is avoided.

14. The apparatus of claim 13, wherein said fourth means further comprises means for determining the feasibility of a candidate bend, wherein the feasibility of the candidate bend is determined by storing position information for a first portion of said sheet stock on one of first and second sides of said candidate bend, projecting position information for a second portion of said sheet stock on the other of said first and second sides of said bend for a plurality of positions corresponding to progressive formation of said candidate bend, and comparing said stored information and said projected information to determine whether interference occurs between said first and second portions.

15. The apparatus of claim 12, wherein said output information is printed on strip material for attachment to said sheet stock and said third means comprises advancing means for advancing said strip material so that instructions for said bends can be placed at positions on said strip material corresponding to bend locations on said sheet stock.

16. The apparatus of claim 12, wherein said output information is printed on said sheet stock and said third means comprises advancing means for advancing said sheet stock so that instructions for said bends can be placed at corresponding locations on said sheet stock.

17. The apparatus of claim 12, further comprising printing means disposed adjacent to said sheet stock for printing bending instructions on both of first and second opposite sides of said sheet stock.

18. An apparatus for use in providing instructions regarding at least a sequence for making a series of bends in sheet stock so as to bend said sheet stock to form a side panel of a housing, said housing including said side panel and a front panel wherein said side panel is shaped to conform to said front panel, comprising:

first means for receiving input information regarding a form of said housing;

second means for determining a sequence for making bends for bending said sheet stock to form said side panel wherein interference between one portion of said sheet stock and another portion of said sheet stock is avoided; and

third means for outputting output information indicative of said sequence for making said bends.

19. The apparatus of claim 18, further comprising means for determining the positions of bends for bending said sheet stock to form said side panel.

20. The apparatus of claim 18, further comprising means for determining shapes of bends for bending said sheet stock to form said side panel of said housing.

21. The apparatus of claim 18, wherein said output information is printed on strip material for attachment to said sheet stock and said third means comprises advancing means for advancing said strip material so that instructions for said bends can be placed at positions on said strip material corresponding to bend locations on said sheet stock.

22. The apparatus of claim 18, wherein said output information is printed on said sheet stock and said third means comprises advancing means for advancing said sheet stock so that instructions for said bends can be placed at corresponding locations on said sheet stock.

23. The apparatus of claim 18, further comprising printing means disposed adjacent to said sheet stock for printing bending instructions on both of first and second opposite sides of said sheet stock.